We consider a specific function of two variables whose graph surface resembles a blue lagoon. The function has a saddle point $p$, but when the function is restricted to
any given straight line through $p$ it has a {\em{strict local minimum}} along that line at $p$.

Original language

English

Publication date

2007

State

Published - 2007

Bibliographical note

The note is a textual support for the presentation of a 3D-printed solid version of the graph surface for the function alluded to in the abstract. The 3D print was made at DTU Mathematics upon special request from Gunnar Mohr, Dean of Studies, DTU.